I cant really compare too much with the other card cause i have minimal experience with nvidia.

Advantages of the 5770 are:
easily overclockable. I have mine at 960mhz from 850, good temps, very stable.
Just note that the core volt cant be unlocked by all manufacturers, MSI would be the best option for this. If i would have known this before purchasing my saphire i would have get the msi instead.

its not too large of a card, it will fit in most cases
quiet, even at 100% fan speed its not extremely audible
easily extra cooled with a simple front or side fan added to your case.

All in all a good card.

also, ati and amd are built to work well together, not sure exactly how it helps, but its supposed to help boost over all computing performance when combined.

Use this promo code: EMCKJJJ72 for another $20 off.
I've had this card OCed at 900Mhz/1.075v or 850Mhz/stock voltage without problem.
And your case is fine since this card is not long at all. Newegg return & customer service is also the best.
So I'd say go for it.Edited by goldbranch - 1/11/11 at 10:35am